Electrochemical Tandem Olefination and Hydrogenation Reaction with Ammonia
作者:Xiaofeng Zhang、Runze Jiang、Xu Cheng
DOI:10.1021/acs.joc.1c01024
日期:2021.11.19
Horner–Wadsworth–Emmons/hydrogenation tandem reaction was achieved using ammonia as electron and proton donors. The reaction could give two-carbon-elongated ester and nitrile from aldehyde or ketones directly. This reaction could proceed with a catalytic amount of base or even without a base. The ammonia provides both the electron and proton for this tandem reaction and enables the catalyst-free hydrogenation
Carbonyls as Latent Alkyl Carbanions for Conjugate Additions
作者:Xi-Jie Dai、Haining Wang、Chao-Jun Li
DOI:10.1002/anie.201700059
日期:2017.5.22
Conjugateaddition of carbon nucleophiles to electron-deficient olefins is one of the most powerful methods for forming carbon–carbon bonds. Despite great achievements in controlling the selectivity, variation of the carbon nucleophiles remains largely underexplored, with this approach relying mostly on organometallic reagents. Herein, we report that naturally abundant carbonyls can act as latent carbon
Short chain fatty acids (SCFAs) and glycerol esters of SCFAs not previously used for that purpose are provided for use as a medicament for treating, preventing or counteracting microbial infections in animals, including humans, by stimulating the innate antimicrobial peptide defense system. Preferred compounds include phenyl substituted short chain fatty acids (SCFAs) derivatives and. Also provided are methods and compositions for treating, preventing or counteracting microbial infections, including bacterial, viral, fungal, and parasitic infections, by administration of medicaments comprising a secretagogue-effective amount of the compounds of the invention.
作者:Pannan Miao、Ruining Li、Xianfeng Lin、Liangming Rao、Zhankui Sun
DOI:10.1039/d1gc00091h
日期:——
Cascade reactions are green and powerful transformations for building multiple carbon–carbon bonds in one step. Through a relay olefination and radical addition process, we were able to develop the cascade Wittig/hydroalkylation reactions induced by visible light. This metal-free radical approach features mild conditions, robustness, and excellent functionality compatibility. It allows access to saturated
Regioselective Alkoxycarbonylation of Allyl Phenyl Ethers Catalyzed by Pd/dppb Under Syngas Conditions
作者:Manuel Amézquita-Valencia、Howard Alper
DOI:10.1021/acs.joc.6b00522
日期:2016.5.6
A simple and regioselective synthesis of phenoxy esters and phenylthio esters is reported. The products are obtained by selective alkoxycarbonylation catalyzed by Pd2(dba)3, 1,4-bis(diphenylphisphino)butane (dppb), and syngas (CO/H2) in chloroform/alcohol. This methodology affords bifunctional products in good yield with excellent n-selectivity and without the need to use additives.